I am amazed by how friendly these people are.

I'm amazed how friendly these people are.

What is the difference between the usage with by and the usage without?

  • No difference in meaning, IMHO. The first is more grammatically correct, but eliding the preposition is common in informal conversation. – Barmar Dec 26 '14 at 15:34
  • See a similar question about "for" a couple hours later: english.stackexchange.com/questions/216985/… – Barmar Dec 26 '14 at 15:35
  • A more common UK English usage would be: I am amazed at how friendly... – user103188 Dec 26 '14 at 16:08
  • Why the downvote? (And the 'for' question is likely not showing the same effect.) – Alan Munn Dec 26 '14 at 16:33
  • "amazed at how" also common in AmE, but AFAIK no more common than "amazed by how" or "amazed how" – Brian Hitchcock Dec 26 '14 at 22:21

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